> DBRef("a", ObjectId("5f16b8bebe434dc98cdfc9cb"), "db") DBRef("a", "5f16b8bebe434dc98cdfc9cb", "db"
where the second argument should include ObjectId(), like the original input.
> DBRef("a", ObjectId("5f16b8bebe434dc98cdfc9cb"), "db") DBRef("a", "5f16b8bebe434dc98cdfc9cb", "db"
where the second argument should include ObjectId(), like the original input.